I know the feeling. We have a lot of people around here that let their dogs roam also. Luckily its not a super busy area so I haven't heard of any of the dogs (within a few blocks at least) getting hit by cars. It drives me crazy, I hate having them come charging at me while I'm walking my dogs on a LEASH. I also see many dogs that are chained/left in the backyard all the time. There's a big malamute on a road I walk the dogs on quite often and I used to walk on that road to high school. It lives on a chain, in the dirt, I think there's a chewed up igloo dog house too. That's its entire life, I have NEVER seen that dog off that chain.